You're lucky you couldn't find one. It's not the best one out there.NGK BPR6ES has proven to be the most popular choice. About $3.00. Some people like the iridium version, but at around $10.00, I don't see the advantage. I changed my 6ES out at 15,000 miles because I had a new one. The old one still looked fine.Bare

I received this reply from the NKG tech support "This bike will take part number BR8ES stock number 5422. I do show that all 500ís took this as OEM equipment".I installed this plug and the engine starts and runs great.

"This bike will take part number BR8ES stock number 5422. I do show that all 500ís took this as OEM equipment".

The 8 may prove to be a bit too cold. I haven't ever seen an Enfield come with an NGK unless it's something new. Actually that sounds more like the plug that was installed in the iron barrels. See my recommendation for the BPR8es in the post above, it's what the majority of the riders on UCEs on this forum are using.Bare